Resistance welding electrode



RESISTANCE WELDING ELECTRODE Filed May 22, 1925 Patented June 12, 1928.

UNITED STATES RAYMOND EUGENE POWELL, OF MAYWOOD, ILEINOZS, ASSEGINOR TQ WES". v

TRIG COMPANY, INCOEPOBAZLED, OF NEW YORK.

RESISTAEQ'GE WELDING ELECTRQDIE.

- App1ication filed May 22, 1926. Serial No. 119,305.

This invention relates to welding apps,

' ratus,and more particularly to electrodes and electrode holders for use in electrical resistance welding.

In some instances in welding by the electrical resistance method, parts to be welded are so designed and proportioned as to render it diihcult to produce .L weld in the do sired position without-causing contacts he to tween the parts and the electrode or holder therefor at points other than the location of the weld. These additional contacts may result inithe fusing of the work at these points as well as cause a diversion o1 a soilicient amount of the welding current from the tip of the electrode to materially reduce I the eficctiveness of the welding operation.

' An object of the invention is to provide a simplified apparatus for electrically welding parts wherein {the current conducting portions are, electrically insulated from the parts except at the position of the weld.

In accordance with one embodiment of the invention, the electrode and the holder therefor are eachsurrounded by a band of steel which has been treated with a solution of phosphoric acid, changing the surface of the steel to a dull'black phosphate of iron which is a good electric insulator under the severe temperature and other conditions encountered in welding.

It is believed that a coniplete understanding of the invention may be had by reference to the following description tfien in conjunction with the accompanying drawing which illustrates one embodiment of the invention.

The drawing illustrates the application Y of electrode unlts l and 2 to the welding of parts of a wall assembly for a loading coil case, such as is used extensively in telephone transmission circuits, in which an singularly shaped piece 4 is welded to a. cylindrical surface 5. The welding current in a resistance welding process in some cases is regulated to the exact amount required to produce a. weld in the material between the electrodes. It, therefore, the lateral surfaces of the electrode or its holder come in contact with the and there may be insufiicient current flowmg from the tips of the electrodes throu h the parts to be welded to forman entirey by a band of steel having a phosphate of iron work, some of the current willbe diverted PATENT ounce.

YORK, El. Y., A CGRE'QRATH satisfactory weld; According to the present invention, copper electrodes 6 and electrode holders 7 or" any usual type and associated with a suitable electrical welding circuit (not shown), are surrounded by steel bands or jackets 8 which have been ,revio y treated in a solution of phosp oric changing the surface of the steel to a black phosphate of iron, thus forming layer of electrica-Iginsulating material on the surfaces of the steel band. Thus the ban s which preferably are pressed over the trodes and the holders form an sheath around these parts preventing a] s version of the welding current through contact with the work and, a consequent loss or energy and fusion of the electrode or holder in to the Work, and insure a suflicient amount of welding current passing through the parts to be welded to form agood weld.

It will be understood that the embodiment of the invention herein described and illu' to trated is merely a useful and convenient form of the invention, which is capable of many other modifications Without departing from the spirit and scope of the invention.

What is claimed is: 8t

1. An electrode unit for electric welding comprising an electrode provided with insulating jacket having a coating of photo phate ofiron, and an electrode holder provided with an insulating jachet having acoating of phosphate of iron.

2. An electrode unit for electric welding comprising an electrode surrounded by a band of steel having a phosphate of iron surface, and an electrode holder surrounded surface.

3. In an electrode unit for electric welding an electrode having an insulating material of phosphate of iron on a surface thereof.

l. In an electrode unit for electric welding an electrode provided with. an insulating jacket having a coating of phosphate 0t iron.

5. In an electrode unit for electric welding an electrode surrounded by a band of steel having a phosphate of iron surface.

In witness whereof, I hereunto subscribe any name this 12th day of May A. D., 1926.

RAYMOND EUGENE POWELL. 

